1686423450 has 96 divisors (see below), whose sum is σ = 4371434496. Its totient is φ = 429831360.

The previous prime is 1686423449. The next prime is 1686423499. The reversal of 1686423450 is 543246861.

It is a junction number, because it is equal to n+sod(n) for n = 1686423399 and 1686423408.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300369 + ... + 305931.

It is an arithmetic number, because the mean of its divisors is an integer number (45535776).

Almost surely, 2^1686423450 is an apocalyptic number.

1686423450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686423450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2185717248).

1686423450 is an abundant number, since it is smaller than the sum of its proper divisors (2685011046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686423450 is a wasteful number, since it uses less digits than its factorization.

1686423450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668 (or 5663 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1686423450 is about 41066.0863730646. The cubic root of 1686423450 is about 1190.2975622894.

The spelling of 1686423450 in words is "one billion, six hundred eighty-six million, four hundred twenty-three thousand, four hundred fifty".